Wasting: leftovers for next PR

[EvaJanouskova]

Leaving some TODOs for next PR, following current #543:

important

• the death from untreated SAM: if SAM determined as clinical acute malnutrition state, do also determine whether the individual will die due to SAM (make sure these individuals are not on treatment or are not already scheduled for death) in xx days since then, i.e., assuming an average number of days to death. Do we think the death from SAM should be determined every time the WHZ changes and the individual has SAM (after the change), or only if the individual didn't have SAM before the change? I would vote for the former, as it can happen in many combinations. If they had SAM but WHZ changed for sure, MUAC and oedema may have changed, it could be that one symptom gets better but another worsens, so it might be time to check if they are supposed to die again.
• ? natural recovery from severe wasting: when progress to severe wasting initiated, and hence the WHZ changes, all the clinical signs are updated—MUAC, oedema, clinical state, complications/death. It will be checked if the person is scheduled to die, and if not, the recovery to moderate wasting will be scheduled after the duration of the severe wasting. When they recover from severe wasting to moderate wasting, they should be scheduled again after the duration of moderate wasting to either progress back to severe wasting or recover to no wasting.
• unschedule progression/recovery event if treatment issued
• additional risks for moderate wasting incidence: HIV, exclu_breastfeeding, diarrhoea, WASH
• parametrise module properly (more detailed calibration? --- diagnosis, treatment, mortality etc.)
• involve an expert in malnutrition e.g. Carlos or Andy Seal in IGH...
• description of linear models to be included in the wasting module's write-up
• community outreach component: community sensitisation, mobilisation, active case finding, referral, follow-up, and counselling
• re-consider full recovery from SAM (the guideline seems to me pointing to OTP always following the SAM treatment, so either full recovery is not expected, or OTP provided as precaution)

non-essential

• see probability_of_severe -> Wouldn't it be more efficient if the wasted categories are generated by the choice fnc at once for all wasted individuals, and also the properties (in the following lines) are set at once?
• ? apply treatment coverage and cure rates at initiation
• looking up of consumables in one function and then access them from there as done in the other modules like RTI and COPD
• ? update GBD data to GBD 2021